A step forward in pedestrian safety from Volvo
The revolutionary new airbag is launched one year after Volvo, as a strategic partner of the Parliamentary Advisory Council for Transport Safety (PACTS), joined road safety experts and MPs to set the blueprint in the UK for safer roads over the next 10 years with the launch of the United Nations Decade of Action for Road Safety. Volvo's new Pedestrian Airbag will go some way to help further reduce the number of fatalities involving pedestrians, currently 14 per cent in Europe and 25 per cent in China.
Every year, 1.3 million people are killed on the world's roads with 24,510 killed or seriously injured in the UK alone. For Volvo, safety has been a key priority for 85 years and in 2008, launched a unique goal in that ‘By 2020, nobody shall be seriously injured or killed in a new Volvo' and to contribute towards the aim, it has fitted technology including Pedestrian Detection, City Safety and the Pedestrian Airbag.
The Pedestrian Airbag technology was a world breakthrough when the all-new Volvo V40 was launched in Geneva earlier this year and will to be fitted as standard to all specifications. The system is active at speeds between 20 and 50 km/h. 75 per cent of all accidents involving pedestrians take place at up to 40 km/h.
The most serious head injuries involving pedestrians and cars are caused by the hard structure under the bonnet, the windscreen's lower edge and the A-pillars. These were the main areas that Volvo Car Corporation looked at when starting development of its Pedestrian Airbag Technology.
Seven sensors embedded in the front of the car transmit signals to a control unit. When the car comes into contact with an object, the signals change. The control unit evaluates the signals and if it registers what it interprets as a human leg the pedestrian airbag is deployed.
The bonnet hinges are each equipped with pyrotechnic release mechanisms which, when the system is activated, pull out a pin and release the rear of the bonnet panel. At the same time, the airbag (consisting of a sack and a gas hybrid generator) is activated and starts filling with gas, which only takes a few milliseconds. During the inflation sequence the airbag raises the bonnet by 10 centimetres and stays in the raised position.
The added gap between the bonnet and the hard components in the engine compartment gives space for the bonnet to deform, creating a dampening effect when it is hit by a pedestrian.
"The airbag has two functions. Firstly, it raises the bonnet to create distance, and secondly it cushions the impact around the hard parts of the area near the windscreen," explains Thomas Broberg, Senior Technical Advisor Safety, Volvo Car Corporation.
In its inflated position, the airbag covers the entire windscreen wiper recess, about one-third of the windscreen and the lower part of the A-pillars. The entire sequence from activation of the system to full inflation takes a few hundredths of a second.